ltm4611 Linear Technology Corporation, ltm4611 Datasheet - Page 7

• Manufacturer Part Number: ltm4611
• Description: Ltm4611 Ultralow Vin, 15a Dc/dc ?module Regulator Features
• Manufacturer: Linear Technology Corporation

Typical perForMance characTerisTics
pin FuncTions
V
voltage between these pins and GND pins. Recommend
placing input decoupling capacitance directly between
V
V
Pins. Apply output load between these pins and GND
pins. Recommend placing output decoupling capacitance
directly between these pins and GND pins. Review Table 5.
GND: (B7, B9, C7, C9, D1-D6, D8, E1-E7, E9, F1-F9, G1-G9,
H1-H9) Power Ground Pins for Both Input and Output
Returns.
PGOOD: (F11, G12) Output Voltage Power Good Indicator.
Open-drain logic output that is pulled to ground when the
output voltage exceeds a ±5% regulation window. Both
pins are tied together internally.
AC-COUPLED
IN
IN
OUT
500mV/DIV
50mV/DIV
2mA/DIV
: (A1-A6, B1-B6, C1-C6) Power Input Pins. Apply input
pins and GND pins.
5A/DIV
1A/DIV
5V/DIV
I
: (J1-J10, K1-K11, L1-L11, M1-M11) Power Output
I
V
V
LOAD
LOAD
RUN
OUT
OUT
I
IN
3.3V Transient Response, 5V
V
2 100µF CERAMIC OUTPUT CAPACITORS
C
7.5A LOAD STEP AT 7.5A/µs
V
3 22µF CERAMIC INPUT CAPACITORS
C
4 100µF CERAMIC OUTPUT CAPACITORS
C
Start-Up, Pre-Bias
IN
FF
IN
SS
FF
= 5V, V
= 10pF , C
= 3.3V, V
= 33pF , C
= 10nF
OUT
OUT
P
P
= NONE
= 10pF
= 3.3V, USING DIFF AMP
= 1.5V, 0.75V PRE-BIAS LOAD
20µs/DIV
2ms/DIV
IN
4611 G08
4611 G13
500mV/DIV
500mV/DIV
1V/DIV
1A/DIV
2A/DIV
V
V
OUT
OUT
V
I
I
IN
IN
IN
Start-Up, No Load
Short-Circuit, 15A
V
3 22µF CERAMIC INPUT CAPACITORS
C
4 100µF CERAMIC OUTPUT CAPACITORS
C
V
15A LOAD PRIOR TO SHORT
IN
SS
FF
IN
= 3.3V, V
= 33pF , C
= 3.3V, V
= 10nF
OUT
OUT
P
= 10pF
= 1.5V, NO LOAD
= 1.5V
20µs/DIV
1ms/DIV
SGND: (G11, H11, H12) Signal Ground Pin. Return ground
path for all analog and low power circuitry. Tie a single
connection to the output capacitor GND in the application.
See the layout guidelines in Figure 17.
MODE_PLLIN: (A8) Forced Continuous Mode, Burst Mode
Operation, or Pulse-Skipping Mode Selection Pin and
External Synchronization Input to Phase Detector Pin.
Connect this pin to GND to force continuous mode
operation. Connect to INTV
ping mode operation. Leaving the pin floating will
enable Burst Mode operation. A clock on this pin will
enable synchronization with forced continuous operation.
See the Applications Information section.
4611 G09
4611 G10
500mV/DIV
500mV/DIV
1V/DIV
5A/DIV
5A/DIV
1A/DIV
I
V
LOAD
V
OUT
OUT
V
I
I
IN
IN
IN
Start-Up, 15A Load
Short-Circuit, No Load
V
3 22µF CERAMIC INPUT CAPACITORS
C
4 100µF CERAMIC OUTPUT CAPACITORS
C
V
NO LOAD PRIOR TO SHORT
IN
SS
FF
IN
= 3.3V, V
= 33pF , C
= 3.3V, V
= 10nF
CC
to enable pulse-skip-
OUT
OUT
P
= 10pF
= 1.5V, 100m LOAD
= 1.5V
LTM4611
20µs/DIV
1ms/DIV

4611 G12
4611 G11
4611f